CN112664420A - Shape memory driver driven quickly at high frequency and preparation method thereof - Google Patents
Shape memory driver driven quickly at high frequency and preparation method thereof Download PDFInfo
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Abstract
The invention provides a shape memory driver driven quickly at high frequency and a preparation method thereof. The shape memory driver driven by high frequency quickly comprises a shape memory material body and a hydrogel coating, wherein the hydrogel coating coats the shape memory material body, and an adhesive interface is formed between the hydrogel coating and the shape memory material body. The shape memory material body is wrapped by the hydrogel coating, and the hydrogel has larger heat capacity, so that the cooling process can be accelerated, and high-frequency rapid driving can be realized. The shape memory material driver of the invention can meet the requirement of the needed cycle number or driving frequency by adjusting the thickness of the hydrogel coating.
Description
Technical Field
The invention relates to the technical field of intelligent material drivers, in particular to a shape memory driver, and particularly relates to a shape memory driver driven quickly at high frequency and a preparation method thereof.
Background
The shape memory material mainly comprises Shape Memory Alloy (SMA) and Shape Memory Polymer (SMP), and is a kind of intelligent material which can memorize the initial shape and has sensing and driving functions. Shape memory has been widely used in the industrial and medical fields. However, the major bottleneck of the shape memory material as the driver is the slow cooling speed after heating, which results in the low operation frequency of the driver. The current cooling methods for shape memory materials are mainly forced convection method of air and water and semiconductor heat sink.
Howe et al designed a shape memory alloy driven tactile shape display with forced convection through a gas nozzle to speed up the cooling process. Taddnse et al use 2.7m/s water flow through the carbon fiber tube to cool the shape memory alloy wire, and the cooling time is increased by about 5 times compared with natural convection of air. Brian Selden et al designed a segmented shape memory alloy actuator that utilized peltier effect thermoelectric devices to accelerate the cooling process, allowing for segmented selective heating and cooling. The invention patent (CN104847611A) also discloses a shape memory alloy actuator based on micro-pipe cooling, which uses a built-in micro-pipe to accelerate the cooling process of the SMA wire, thereby increasing the reciprocating frequency of the SMA actuator. The methods can obviously reduce the cooling time of the shape memory material and improve the action frequency of the driver, but external mechanical equipment such as a power supply, a pump and the like is inevitably introduced, so that the overall weight and the volume of the driver are increased, and the overall energy consumption of the driver is also increased.
The invention provides a method for improving the heat dissipation performance of a shape memory material by adopting a hydrogel material as a coating of the shape memory material so as to improve the response frequency of the shape memory material. The hydrogel is a gel substance which takes water as a dispersion medium, has high water content and soft property, and is widely applied to bioengineering, pharmaceutical engineering and the like. The hydrogel attracts the research of various scholars in recent years, and the theoretical research and the practical application of the hydrogel are greatly developed. The hydrogel material has a large amount of moisture, and the high specific heat capacity of water enables the hydrogel material to help a high-temperature object to be rapidly cooled.
Disclosure of Invention
The invention aims to solve the problems that a cooling system of the existing shape memory driver is heavy and the response frequency of the existing shape memory driver is not high, and provides a shape memory driver driven quickly at high frequency and a preparation method thereof.
In order to solve the technical problem, the invention provides a shape memory driver driven quickly at high frequency, which is characterized by comprising a shape memory material body and a hydrogel coating, wherein the hydrogel coating coats the shape memory material body, and an adhesive interface is formed between the hydrogel coating and the shape memory material body.
Further, the shape memory material body is a shape memory alloy or a shape memory polymer.
Further, the shape of the shape memory material is a three-dimensional shape such as a wire, a twisted wire, a plane, and a spring.
Further, the hydrogel coating is composed of hydrophilic macromolecules and moisture.
Furthermore, the hydrogel forms a bonding interface with the surface of the shape memory material body through chemical bonds, hydrogen bonds or physical lap joint.
Further, the hydrogel coating may have different thicknesses to achieve different cycle times and drive frequencies for the shape memory actuator.
The invention also provides a preparation method of the shape memory driver driven by high frequency fast, which is characterized by comprising the following steps:
s1, preparing a shape memory alloy material body;
s2, preparation of hydrogel: 7.1g acrylamide (AAm) was placed in a centrifuge tube and 42.4mL deionized water, 0.5mL aqueous α -ketoglutarate (α -keto) solution at a concentration of 0.1mol/L, 95 μ L Trimethoxysilane (TMSPMA), and 50 terephthalic acid (CTA) were added. Shaking up by oscillation, centrifuging to remove bubbles, transferring the solution into a prefabricated polytetrafluoroethylene mold, and illuminating for 30min under the ultraviolet light with the wavelength of 365nm under the oxygen-free condition to enable the solution to form a hydrogel coating;
s3, placing the shape memory material body in hydrogel coating to be spin-coated or dip-coated, so that the shape memory material body is uniformly wrapped by the hydrogel;
s4, packaging the shape memory material body with the hydrogel coating, keeping the humidity, standing in an oven for 8 hours at the temperature of 65 ℃, and curing the liquid hydrogel coating to form solid hydrogel, thus completing the preparation.
The beneficial technical effects obtained by the invention are as follows: the hydrogel coating has the characteristics of high-efficiency heat transfer and large deformation, and ensures that the driver has good safety, flexibility and flexibility.
The shape memory material body is wrapped by the hydrogel coating, and the hydrogel has larger heat capacity, so that the cooling process can be accelerated, and high-frequency rapid driving is realized.
The high-speed driving shape memory material driver can be operated independently and can also be connected in series and/or in parallel, so that high-load driving is realized.
The invention can realize unidirectional linear driving and can also realize bidirectional reversible motion by matching with a bias spring or a bias load.
The shape memory material with the hydrogel coating prepared by the invention has good integrity, and the hydrogel material can not fall off from the surface because of good adhesion with the shape memory material.
The shape memory material driver prepared by the invention can meet the requirement of the required cycle number or driving frequency by adjusting the thickness of the hydrogel coating.
The hydrogel coating is light in weight, is attached to the shape memory material, does not obviously increase the whole volume and weight of the driver, and is simple to operate and low in cost.
Drawings
Fig. 1 is a schematic structural view of the present invention.
In the drawings: 1-body of shape memory material, 2-coating of hydrogel.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in figure 1, the shape memory actuator for high-frequency quick actuation is characterized by comprising a shape memory material body 1 and a hydrogel coating 2, wherein the hydrogel coating 2 wraps the shape memory material body 1, and an adhesive interface is formed between the hydrogel coating 2 and the shape memory material body 1.
The shape memory material body 1 is, but not limited to, a shape memory alloy, a shape memory polymer or other intelligent materials with a shape memory function.
The shape of the shape memory material body 1 may be, but not limited to, a three-dimensional shape such as a wire, a twisted wire, a plane, or a spiral.
The hydrogel coating 2 is composed of hydrophilic macromolecules and water and is uniformly wrapped on the surface of the shape memory material body 1.
The hydrogel coating forms a bonding interface with the surface of the shape memory material body 1 through chemical bonds, hydrogen bonds or physical lap joint.
The hydrogel coating may have different thicknesses to allow the shape memory actuator to achieve different cycle times and drive frequencies.
The invention also provides a preparation method of the shape memory driver driven by high frequency fast, which is characterized by comprising the following steps:
s1, preparing a shape memory alloy material body;
s2, preparation of hydrogel: 7.1g acrylamide (AAm) was placed in a centrifuge tube and 42.4mL deionized water, 0.5mL 0.1mol/L aqueous α -ketoglutarate (α -keto) solution, 95 μ L methoxysilane (TMSPMA), and 50 terephthalic acid (CTA) were added. Shaking up by oscillation, centrifuging to remove bubbles, transferring the solution into a prefabricated polytetrafluoroethylene mold, and illuminating for 30min under the ultraviolet light with the wavelength of 365nm under the oxygen-free condition to enable the solution to form a hydrogel coating;
s3, placing the shape memory material body in hydrogel coating to be spin-coated or dip-coated, so that the shape memory material body is uniformly wrapped by the hydrogel;
s4, packaging the shape memory material body with the hydrogel coating, keeping the humidity, standing in an oven for 8 hours at the temperature of 65 ℃, and curing the liquid hydrogel coating to form solid hydrogel, thus completing the preparation.
The beneficial technical effects obtained by the invention are as follows:
the hydrogel coating has the characteristics of high-efficiency heat transfer and large deformation, and ensures that the driver has good safety, flexibility and flexibility.
The shape memory material body is wrapped by the hydrogel coating, and the hydrogel has larger heat capacity, so that the cooling process can be accelerated, and high-frequency rapid driving is realized.
The high-speed driving shape memory material driver can be operated independently and can also be connected in series and/or in parallel, so that high-load driving is realized.
The invention can realize unidirectional linear driving and can also realize bidirectional reversible motion by matching with a bias spring or a bias load.
The shape memory material with the hydrogel coating prepared by the invention has good integrity, and the hydrogel material can not fall off from the surface because of good adhesion with the shape memory material.
The shape memory material driver prepared by the invention can meet the requirement of the required cycle number or driving frequency by adjusting the thickness of the hydrogel coating.
The hydrogel coating is light in weight, is attached to the shape memory material, does not obviously increase the whole volume and weight of the driver, and is simple to operate and low in cost.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (8)
1. The shape memory driver is characterized by comprising a shape memory material body and a hydrogel coating, wherein the hydrogel coating coats the shape memory material body, and an adhesive interface is formed between the hydrogel coating and the shape memory material body.
2. A high frequency fast acting shape memory actuator as claimed in claim 1, wherein the shape memory material body is a shape memory alloy or a shape memory polymer.
3. A high frequency fast driving shape memory actuator according to claim 1, wherein the shape memory material is in a three-dimensional shape such as a wire, a twisted wire, a plane or a spiral.
4. A high frequency rapid actuation shape memory actuator as claimed in claim 1, wherein said hydrogel coating is composed of hydrophilic polymer and moisture.
5. A high frequency rapid actuation shape memory actuator according to claim 1, wherein the hydrogel forms a bonding interface with the surface of the shape memory material body by chemical bonding, hydrogen bonding or physical bonding.
6. A high frequency rapid actuation shape memory actuator of claim 1 wherein the hydrogel coating can have different thicknesses to achieve different cycle times and actuation frequencies for the shape memory actuator.
7. A method of manufacturing a high frequency fast acting shape memory actuator as claimed in any one of claims 1 to 6, comprising the steps of:
s1, preparing a shape memory alloy material body;
s2, preparation of hydrogel: 7.1g acrylamide (AAm) was placed in a centrifuge tube and 42.4mL deionized water, 0.5mL aqueous α -ketoglutarate (α -keto) solution at a concentration of 0.1mol/L, 95 μ L Trimethoxysilane (TMSPMA), and 50 terephthalic acid (CTA) were added.
8. Shaking up by oscillation, centrifuging to remove bubbles, transferring the solution into a prefabricated polytetrafluoroethylene mold, and illuminating for 30min under the ultraviolet light with the wavelength of 365nm under the oxygen-free condition to enable the solution to form a hydrogel coating;
s3, placing the shape memory material body in hydrogel coating to be spin-coated or dip-coated, so that the shape memory material body is uniformly wrapped by the hydrogel;
s4, packaging the shape memory material body with the hydrogel coating, keeping the humidity, standing in an oven for 8 hours at the temperature of 65 ℃, and curing the liquid hydrogel coating to form solid hydrogel, thus completing the preparation.
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| CN113858227A (en) * | 2021-09-28 | 2021-12-31 | 浙江大学 | Robot frogman, shape memory alloy wire driving assembly and manufacturing method thereof |
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